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This reverts commit 3c753781.

Reason for revert: Observed content tearing e.g. on video,
see https://crbug.com/835362

Original change's description:
> Perform glFlush only on NVIDIA platforms
> 
> EGL_EXT_image_flush_external is broken on NVIDIA and causes image
> corruption.
> 
> corruption.
> 
> Bug: 833975
> Test: Ran on nyan_big, samus and veyron_jerry and verified there is no
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I218bb111470e7db18906834f43fd1ad92f28b4bc
> Reviewed-on: https://chromium-review.googlesource.com/1017236
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#552121}

TBR=reveman@chromium.org,kbr@chromium.org,dnicoara@chromium.org,dcastagna@chromium.org,hoegsberg@chromium.org

Change-Id: Id81eaa6c2ff74e5ab5f7935d5a0fcf470e5317f8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 833975
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1021973Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552389}